Grate-bar.



No. 64|,|24. Pa'entedV Jan. 9, 1900. G. S. LEE.

GRATE BAR.

(Application filed Aug. 29, 1899,)

(No Model.)

IIIIIIIIIIIIIIIIIIHIK nrrEn STATES PATENT OrFroE..

GEORGE SANFORD LEE, OF HAWTHORNE, NEW JERSEY, ASSIGNOR TO FRED W. VENTWORTI-I, OF PATERSON, NEW JERSEY.

G RATE-BAR.

SPECIFICATION forming part of Letters Patent No. 641,124, dated January 9, 19001.

Application led August 29, 1899. Serial No. 728,832. (No model.)

To a/ZZ whom it may concern:

Be it known that I, GEORGE SANFORD LEE, a citizen of the United States, residingat Hawthorne, in the county of Passaic andState of New Jersey, have invented certain new and useful Improvements in Grate-Bars and I do hereby declare the following to be a full, clear,

. and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of .reference marked thereon, which form a part of this specification.

My invention relates to apparatus for promoting combustion; and it has reference particularly to an apparatus described, illustrated, and claimed in another and cepending application filed by me October 24, 1899, which application is a division of this my present one.

The object of theinvention is to provide an improved form of hollow grate-bar. This grate-bar, though I prefer to use it in connection with my improved combustion apparatus above referred to, may be used in other combustion apparatus. Therefore, thoughI illustrate and describe my improved gratebar in connection with my peculiar furnace construction, I wish it to be understood that I am not limited correspondingly.

My invention therefore consists in an improved form of hollow grate-bar and in the combination and arrangement of the parts thereof, substantiallyas will be hereinafter pointed out, and `finally embodied in the clauses of the claim. l

The invention is fullyillustrated in the accompanying drawings, wherein- Figure l is a sectional view of a furnace of the steam-boiler class constructed after the principles disclosed in my aboveementioned copending application and embodying my improved :form of gratebar. Fig. 2 is an enlarged view, in side elevation, of two of my improved hollow grate-bars connected. Fig. 3 is a longitudinal sectional view of one of said grate-bars. Figs. 4 and 5 are transverse sectional views on the lines .r and y y, respectively, in Fig. 2. Fig. 6 is a top plan view of two of my improved grate-bars arranged side by side as when in position in the furnace,

certain parts thereof being broken away; and Fig. 7 is a perspective View of one of aseries of certain blocks or bricks used in my improved furnace for dispersing the gases that are unconsumed in the initial combustionchamber.

In said drawings, a designates the exterior Wall structure ofthe furnace, the saine being of any Well-known construction and being 'provided at its front end with the usual fuelsupply and ash-pit doors ct' and di, respectively.

doors, its inner edge being provided with a4 flange c', upon which rests the front ends of the grate-bars c2, the rear ends of said gratebars being supported upon a girder c3, extending across the furnace. The front ends of other grate-bars c4, preferably arranged in alinement with the grate-bars c, also rest on the girder c3, their rear ends being set in an opening or individual openings c6 that are provided in the bridge-wall. comprising the plate @and the series of gratebars, it will be seen, divides the forward compartment of the two above referred to into the ash-pit d and what I term an initial combustion-chamber'd. The other of the two compartments referred to is designated by the reference character cl2 and constitutes a secondary combustion-chamber.

Each grate-bar is constructed hollow, having a channel formed therein that extends throughout the bar and has both ingress and' The structure Y egress openings at the same end of the bar-a that is to say, at the rear end thereof. When two or more bars are used, as the bars c2 and c4, above referred to and shown in the drawings, they are disposed in tandem arrangea IOO ment, the egress-opening of the one communicating with the channel of the other at the front end thereof7 so that there is thus formed a single channel throughout the two bars, having two feed or ingress openings and a single egress-opening at its rear end. s

Above the openings c5, in which the rear ends of the grate-bars c4 rest and with the channels in which they have communication, there is provided in the bridge-wall b an opening e, which extends across the furnace from one side wall to the other thereof. This opening is cut up into a number of smaller openings by a series of vertically-disposed blocks e', preferably constituting bricks of fire-clay, which have the edges thereof adjacent the initial combustion-chamber beveled off, as at e2. The object of providing these blocks e is to effect a thorough breaking up and dispersing of the gases that are evolved in the primary combustion that is carried on in the initial combustion-chamber d and which are forced out through the opening e into the secondary combustionchamber. By' beveling the blocks the agitation of these gases will be materially augmented, as will be apparent.

Upon thepier f,which I have formed at the bottom of the furnace and which extending across the .same constitutes a portion of the bridge-wall I erect back of said bridge-wall a detlecting-wallf, which is slightly spaced from said bridge-wall and has its top surface inclined so that the lower edge f2 (which is its front one) thereof is-about in a horizontal plane that is midway between the openings e and c5, respectively. The rear edge f3 of this wall is approximately as high as the top of the opening e, and in approximate Vertical alinement with it is the front lower edge fl of a wall f5, that spans the furnace-chamber. A narrow opening ff is thus formed.

It will be seen that the bridge-wall and the structure comprised in the deiecting-wall f and the wall f 5 together separate the furnacespace into two compartments, of which the one comprises a primary combustion-chamber-and the ash-pit and the other constitutes the secondarycombustion-chamber. Furthermore, the bridge-wall being spaced from the structure comprising the other two walls combines therewith to form what I term a mixing-chamber f8.

It will be seen that in the operation of the furnace above described the combustion of the fuel that is placed upon the grate-bars is supported by the air which is admitted from the ash-pit between the grate-bars, and simultaneously air enters from the ash-pit the ingress-openings of the channels of the several grate-bars and being conducted back and forth through each grate-bar passes out of its 'egress-opening and the opening c5 in the bridge-wall, whereupon it isdeflected upwardly by the deflecting-wall f. Now as the gases that are evolved but not consumed in the primary combustion above referred to are driven out of the initial combustion-chamber they are thoroughly broken up and agitated by the beveled blocks e' and after passing said blocks are commingled in the mixingchamber f8 with the rising bodies of air that.

ycombustion that is going on in the initial combustion-chamber the temperature of the fresh bodies of air that are supporting this secondary combustion has been raised, and consequently they quite readily release their oxygen.

It should be remarked that in order to best give the gases and other products of combustion that are passing out of the initial combustion-chamber proper direction,so that they will move out with facility, the bricks of which the bridge -wall is composed should be disposed so as to successively overhang each other, as at f7.

So faras the grate-bars are concerned, any construction in which the grate-bars are hollow will suffice so long as that by it the temperature of the air as it passes through said grate-bars may be materially raised. I prefer, however, to use that form of grate-bar which I will hereinafter particularly describe.

Between the bridge-wall b and the deiiecting-wallf one side wall may have an opening g, whereby refuse that collects there may be removed. The pit g', formed by the space between these walls, may be as deep as desired, the said opening being arranged, preferably, at the bottom of it.

My improved form of hollow gratebar shown in Figs. 2 to 6, inclusive, of the drawings comprises two sections, one of which, 71, is tubular, is open at both ends, and has a further opening h in its under side and near one end, and the otherof which, h2, is troughshaped and receives the section hand has an opening h3 at one of its ends. Its channel, furthermore, has communication with the section h through the opening h near the other of its ends. In cross-section the section his substantially wedge-shaped, and it rests in similarly-shaped sockets h4, formed in projections t' i', extending from the ends of the secd tion h2. The upper edges of the sides of the section h2 are iiat, as at i2, and both side surfaces of the section h are provided with longitudinal iianges 3, which rest upon said at edges. Thecross-sectional form of the section h should by preference be V-shaped. Thi4s appears from what is shown in Fig. 5 at t' f Each grate-bar may be provided at one or both sides with spacing-lu gs. These lugs are IOO IZO

shown in the drawings as being mounted on the section h near the ends and near the center thereof and on the section h2 near one end thereof. Said lugs are designated by the ref erence character y'.

In order to feed upwardly to the fuel some of the air that is passing through the gratebars, I provide orifices .70, which penetrate the section 7L and are inclined slightly downwardly toward the exterior of said section and which pass out of the grate-bar at the exterior line of juncture between its two sections, thereby cutting away, as at lc', a portion of the section h2. It will be seen that the iiange 113 overhangs each of the cut-out portions 7a', forming the exterior of each orice, thus acting asa hood, as it were, to prevent dust, &c. that drops from the top of the grate-bar from clogging the orifice.

Extending from the projection t" at the front end of the section h is a rectangular socket 7a2. This socket is adapted to receive the rear end or the projection i, more accurately speaking, of the section h2 of another grate-bar when two grate-bars are used in tandem, as shown in Fig. 1. When each bar is used alone or singly, in order to close the front end of the bar a block 7a3 is provided, said block resting in the socket k2 and being secured therein by a pin or bolt 7a4.

It will be seen that in the improved construction of hollow grate-bar which I have hereinbefore described the sections may not only be readily taken apart for repairs, cleaning, dac., but owing to the arrangement of said sections the possibility of any appreciable and undesirable leakage is obviated. Furthermore, my improved grate-bar is very simple and durable in construction and is so formed that with the least possible change in its structure it may be used either singly or in tandem with other grate-bars of similar construction.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. A grate-bar consisting of two members or sections, one of said members being substantially tubular and the other of said members receiving said rst-named member, said members having communication with each other and each having exterior communication at one of its ends, substantially as described.

2. A grate-bar consisting of two members, one of said members being substantially tu bular and the other of said members having a longitudinal groove receiving said irstnamed member, said members having communication with each other and each having exterior communication at one of its ends, substantially as described.

3. A grate-bar consisting of two members, one of said members being substantially tubular and the other of said members being substantially trough-shaped, said first-named member being disposed against the open side of the other member and having communication therewith and both of said members being open at the same end of the grate-bar, substantially as described.

4. A grate-bar consisting of two interlocking hollow members disposed the one above the other and communicating with each other, the upper member having downwardly-inclined orifices extending through its side wall and both of said members being open at the same end of the bar, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 15th day of August, 1899.

GEORGE SANFORD LEE.

Witnesses ALFRED GARTNER, LOUISE SNYDER. 

